Stop mechanism



.March 2,1926. 1,575,105

A. B. FOWLER STOP MECHANISM Filed Oct. 25. 1919 4 Sheets-Sheet 2 ZW/9. 4y

mugs

March 2,1926. 1,575,105

Y lA. B. FOWLER STOP MECHANISM Y Filed oct. 25, 1919 4 sheets-sheet sMarch 2 1926.

A. B. FQWLER sToP MEcHANIsM Filed Oct' 25' 1919 4 sheets-sheet 4Patented Mar. 2, 1926.

ALFRED B. FOWLER, OF BEVERLY, MASSACHUSETTS, ASSIGN UNITED SHOEMACHINERY CORPORATION?, 0E rnfrnnsolvy NEW JEnsEYgg rom'rron or NEWJERSEY.

STOP MECHAN-ISM.

Application filed October 25', 1919, Serial No. 333,275.

To all whom t may conce-ra.'

Be it known that I, Airuno B. Fownnr, a citizen` of the United States,residing at Beverly, in the county of Essex and State oflvlassachusettghave invented certain new and useful Improvements; inStop Mechanisms; and` I do hereby declare the following to be a full,clear, and exact description of thel invention,` such as will enableothers skilled inthe art to` which it appertains to malte and use thesame.

The present invention relates toA` mechanisms. for stopping a machine.with lthe driven parts in, a predetermined posit-ion, and` moreparticularly to stop mechanisms especially adapted for use in a machinewherein it is desirable to render certa-in parts or devices active forapredeterminedinten val during the fina-l cycle of operations. A-

machine of this type is' the inseam shoe sewing machine illustrated anddescribed in applicants (Jo-pending application, Serial No. 298,589,ytiled May 21, 19119,l inv which thread cutting and holding devices areemployed that are rendered active for a predetermined. interval duringthe linal cycle of operations of the machine.

The object of the present invention is to provide a novel and 'improvedstop. mechanism of the class above indicated, which vis relativelysimple in construction and cer-V tain and reliable in operation.v

Vithitghis object in view, the features of the present inventioncomprise certain constructions,l arrangements andv combinations of partshereinafter described. and claimed,

the advantages ofV which will be obvious to those skilled in. the art..`

The several features of the present invention will be clearly understoodfrom the following descrip-tion and accompanying drawings in which.:Figure 1 isf a front elevation, partly in section, of a .portion of amachine embodying the features of the invention. in their preferred.form; Figs. 2 and 3 are enlarged detailed sectional views taken on. thelines 2 -2 and-3 3. of Fig. 8v, hereinafter described; Fig. 4 is a.vertical sectional' view taken axially through. the main shaft of themachine and show-ing the stop mecha-.

nism in stopping position ;4 Fig. 5 is a. seotional view taken on theliney 5 5 of Fig.- 4. with a portion of the casing broken away; Fig. 6is4 a view similar to Fig. 5 but with. the partsr shown. in thepositions which they detail sectional view taken on the line ll-ll ofFig. 2.

In theA drawings the invention is shown' embodied in a mechanism fordriving: and stopping ashaft 2 from which the operating parts 0f asewing or other machine may be driven.

T he illustrated stop mechanism includes a. high speed' drivingmechanism and a lowr speed driving mechanism- The high speeddrivingliechanism is adapted to drive the machine during the normal opera-tionthereof, and the lowfspeed driving mechanism is adapted, to beI thrownin when the high. speed driving mechanism is thrown, out, and isdesigned to act firstl to reduce the speed of the machine and then tovdrive the machine at a low speed to stopping position.

The higlr speed driving mechanism comprises a continuously driven pulley4e loosely mounted on the shaft 2, which pulley is adapted to beclutched to the shaft by the engagement o-f a friction clutch face 6 on.the interior thereof with a conical friction clutch face 8 on a clutchmember 10 which is splined on the shaft.

The low speed driving mechanism coinprises a spiral gear or worm wheel12 which is liournaled on a collar 14 secured to the shaft 2. The rwormwheel l2 is continuonsly driven through speed reduci'irg;` gearing fromthe high speed pulley 1l. This gearing comprises a spiral gearor worml(3, secured to the. forward end of va counter shaft 18, whichoperatively engages the gear l2. Gir the rear end of said' counter shaftis secured a spiral gear 2Ol which engages a spiral gear 22 carried by acounter shaft A spur gear 2G is secured to the right end of the countershaft .2a and' is operatively engaged by a spur gear 28 secured byscrews 30 to the pulley fr. The worm wheel 12 carries a clutch member 82having a conical friction clutch face 34 which is adapted to be engagedby a friction clutch face 36 on the clutch member 10. The y,.vrprifnwheel 12 also carries the driving meinber'38 of a one waypositive roll clutch 40, the driven member of which comprises a sleeve42 secured to the shaft 2. A pair of rolls 44 (Figs. 2 and 8) areinterposed between said members of the clutch and are urged in adirection to clutch said members together by springs 46. The rolls areadapted to be shifted in the opposite direction to release the clutch bymeans of a rotatable ring 48 having lugs 50 extending longitudinally ofthe rolls, the ring 48 ibeing thus actuated by means here3 inafterdescribed.

The clutch member 10 is urged towards the low speed clutch member 32 bymeans of springs 54 located in sockets in the mem-- ber 10 andinterposed between the inner ends of the sockets and a collar 56 formedon the driven shaft 2. The clutch member 10 is adapted to be shiftedtoward the pulley 4 by means of a collar 58 which is splined on the hubof the collar 14. The collar 58 actuates the clutch member 10 throughsliding pins 60 and 61 which extend through apertures in the collar 14and through slots 62 in the clutch ring 48. The pin 60 is provided witha cam surface 68 which is adapted to act on one side of its slot 62 sothat when the collar 58 is shifted toward the right a sufficientdistance, the clutch ring 48 will be rotated to release the roll clutch40. The collar 58 is provided with an annular groove 64 which is engagedby studs or rolls on a forked arm 66 secured to a rock shaft 68. An arm(Fig. l) is secured to the forward end of the rock shaft 68 and the freeend of this arm is connected by a rod 72 with a treadle mechanism (notshown) located at the base of the machine. Wvhen the rod 7 2 isdepressed by means of the treadle mechanism, the arm 70 is swungdownwardly which, through the rock shaft 68 and arm 66 shifts the collar58 to bring the; clutch member 10 into clutching engagement with thehigh speed pulley 4, whereupon the machine is driven at high speed. Whenthe treadle rod 72 is released, a torsion spring 7 6 having one endconnected to a lug 78 on the arm 66 and its other end connected to theframe of the machine, acts to shift the collar 58 to the left, whereuponthe springs 54 are permitted to shift the clutch member 10 to throw outthe high speed driving mechanism and immediately to engage the clutchmember with the clutch member 32 of the low speed driving mechanism. Theengagement of the clutch members 10 and 82 acts te reduce gradually thespeed of the shaft 2 to that of the worm wheel 12, whereupon the wormwheel acts to drive the shaft positively through the roll clutch 40.This movement of the collar 58 toward the left is limited by theengagement of a shoulder 7 9 on a stop lug 80 (Fig. 1), secured to thearm 70, with the lower end of a latch lever 82 pivoted on the frame ofthe machine. At a predetermined point in the rotation of the main shaft,a cam 84 carried by the clutch member 10 engages the upper end of thelatch lever 82, whereupon, the lever is swung out of engagement with thelug which permits the torsion spring 76 to shift the collar 58 intoposition so that its further rotation will cause a lug 86 formed thereonto engage a lug 88 on a controlling cam block 90. The cam block 90 isnormally stationary and is loosely mounted on the main shaft. Theengagement of the lug 86 with the lug 88 results in the cam block beingcarried in unison with the shaft 2 for a predetermined part of onerevolution, whereupon the collar 58 is shifted to move the lug 86 out ofengagement with the cam block. The cam block is held in this advancedposition by the engagement of a lug 92 thereon with the upper end of aspring actuated latch lever 94 pivoted at 95 on the frame of the ma.-chine.

The movement of the collar 58 out of engagement with the cam block isaccomplished by means of a plunger 96 mounted to slide in a bearing inthe frame of the machine which engages a block 98 adjustbly secured tothe upper end of the forward fork of the collar shifting arm 66. Theplunger is actuated by the engagement of a roll 100 on the left endthereof with a cam 102 carried by a hand wheel 104 secured to the end ofthe main shaft of the ma` chine.

The foregoing described advancing move` ment of the cam block 90 may beutilized to render active certain parts or devices of the machine, inwhich the stop mechanism is embodied, for a predetermined intervalduring the final cycle of operations, for example, in the sewing machineillustra-ted and described in said co-pending application, a cam blockcorresponding to the cam block 90 is employed to release the brakeconnected with the tension wheel and to throw in the clutch whichoperates the thread cutting and holding devices.

At the completion of a predetermined number of degrees of rotation ofthe main shaft after the collar 58 is shifted out of engagement with thecam block, the collar is further shifted to the right a sufficientdistance to release the roll clutch 40 of the low speed drivingmechanism and to bring the clutch member 10 into neutral position. Thisadditional movement of the collar 58 is accomplished by means of aplunger 106 mounted to slide in a bearing in the cam i interval.

block, which plunger engages the upper end 108 of the rear fork of thecollar shifting arm 66. This plunger is actuated by the engagement of aroll 11() mounted on the left endy thereof with a cam 112 carried by thehand wheel 1204. After the collar 58. isl thus shifted by the plunger106v to bring the` clutch member 10 into neutralv position, the collar58 is held in this position, until the driving mechanism is again throwninto operation by the operator, by a latch 114 (see Figs. 5, 6, 7 and 8)pivotally mounted at 91 on the cam block 90 and acted upon by a spring93, which latch moves intov a position to engage die adjustable block 98as indicated in Fig. 7. When the machine is at rest, therefore, the mainshaft is free from any driving or braking mechanism and can bey rotatedby hand by means of the hand Wheel 104 as may be desired.

It will be noted that when the treadle rod 72 is allowed to rise instopping the machine the clutch mechanism is actuated to shift directlyfrom the high to the low speed drive and that this shiftV from the highto the low speed drive may occur at any point in the revolution of themain shaft. It will also be noted that this shift i from the h-igh tothe low speed. drive does not immediately bring the con-trolling camblock 90 into operation but that the opera tion of the cam block isdelayed untilI the main shaft has been driven by the low speed mechanismfor at least a predetermined- This result is accomplished by theprovision of the latch. 82 and the cam 84 by which it is actuated at apredetermined: point in the rotation of the main sha-ft. The latch 82can only be actuated when the low speed drive is in operation and theengagement of the lug 86 on the clutch shifting collar 58 with the lug88 on the cam block 90r occurs a certain and definite number of degreesof revolution F after the latch 82 has been operated. This insures `asufficient period of time between the throwing in of the low speed driveand the actuation of the controlling cam block to slow down the speed ofthe shaft to that of the low speed drive so that the controlling camblock is actuated while the machine is being positively driven throughthe roll clutch at a comparatively slow .swinging the lever on its pivotto disengage the upper end thereof fromY the lug 92k on the cam block90. This allows a torsion This action of the controlling cani.

spring 129 having one end secured to. the frame of the machine. and. itsother end secured to the cam block to return the cani block to its.initiall position. This retracting movement ofthe cam block, which is ina direction reverse to that of the rotation of the main shaft, islimited by the engagemeut of a lug 122 onthe cam block with a yieldingstop or buffer 124 on the frame. of the machine. This buffer comprises alug projecting from the framel and av spring 126 having one end securedto the lug.

During the normal operation of the ma chine the operator by varying theamount. ofl pressure on the treadle mechanism may vary the degree offrictional contact between the clutch faces on the clutch member 10 andthe highspeed driving pulley 4 and thereby vary the speed of themachine. In the illustrated machine it is also possible toy throw in thelow speed driving mechanism without bringing the lug 86 into a positionto engage the lug 88, soy that thel machine may be driven during itsnormal operation by the low speed mechanismk This may be accomplished bythe operator releasing the treadle rod 72 only a suiiicient amount tothrow in the low speed mech anism and by maintaining the treadle roc` inthisV position. By releasing the treadle rod sufficiently tothrow outthe high speed mechanism without throwing in the low speed mechanism,the machine may be stopped by the resistance of 'its parts withoutthrowing the cam block into operation.

The operation of the mechanism illustrated in the drawings has .beenindicated in connection with the description of the construction, butmay be briefly summarized as. follows: Starting with the parts at resi:in the positions indicated inthe drawings, a depression of the treadlerod 72 acting through the arm 70, roch shaft 68 and forked arm 66, willmove the collar 5S to the right, as viewed in Fig. 4, and through thesliding pins and 61 will force the clutch member 10 into engagement withthe clutch face on the driving pulleyy 4 Through the pulley 4 and clutchmember` 1'() the shaft 2` will be driven at high speed until; thetreadle rod 7 2 is allowed to rise. The depression of the treadle rod 72in ystarting the machinealso releases the cam block 9() by moving thelatch lever 94 out of engagement with the lng 92 and there by allowsthecam. block to moveto the position indicated in Fig. 6. l

Then the treadle rod 72v is released by the operator theL collar 58 isshifted to the left. as viewed in Fig. 4, a suici'ent distance to permitthe clutchmember 10 to be moved by the springs 54 out of engagement withthe driving pulley 4 and into engagement with the low speed drivingmember 32. By the action of the low speed driving mechanism the speed ofthe shaft is first reduced and the shaft is then driven at the lowspeed. While the sha-ft is being driven by the low speed mechanism, thelatch lever is actuated by the cam projection 84 on the clutch member 10to release the arm 70 and permit the collar 5S to be moved still furthertowards the left, as viewed in Fig. 4i. After this movement of thecollar 58 the continued rotation of the shaft 2 brings the lug 86 on thecollar into engagement with the lng 8S on the cam block 90, and theblock is moved from the position indicated in Fig. G to that indicatedin Fig. 5, in which position it is engaged and held by the latch 94. Asthe block 90 reaches the position indicated in Fig. 5, the collar 58 isshifted to the right, as viewed in Fig. Il, by the action of the plunger96 and cam 102 on the hand wheel 104 to disengage the collar 58 from theblock. Continued rota tion of the shaft 2 causes an actuation of theplunger 10G by the cam 112 on the hand wheel 104.- and through theplunger a further movement of the collar 58 to the right sufficient tocause the sliding pins 60 and 61 to release the roll clutch between thelow speed driving member and the shaft 2. The collar 5S is held in thisposition by the latch 11st on the cam block 90 until the treadle rod'72- is again depressed by the` operator.

The nature and scope of the invention having been indicated and amachine embodying the several features of the invention in theirpreferred form having been specifically described, what is claimed is 1.A stop mechanism having, in combina-- tion, a driven member, a highspeed driving iechanism therefor, a low speed driving mechanism thereforcomprising a friction clutch and a positive clutch. the friction clutchacting first to reduce the speed of the driven member to that of the lowspeed mechanism and the positive clutch then acting to drive the drivenmember, and means for shifting from the high to the low speed drivingmechanisms.

2. A stop mechanism having, in combination, a driven member, a highspeed driving mechanism therefor, a low speed driving mechanism thereforcomprising frictional and positive driving means acting first to reducegradually the speed of the driven member to its own speed and then todrive the driven member positively, and means for shifting from the highto the low speed mechanisms.

3. A stopincchanism having, in combination, a driven member, a highspeed driving mechanism therefor, a low speed driving mechanismtherefor, comprising cooperating friction clutch members for reducingthe speed of the driven member, and means independent of said clutchmembers for then driving the driven member, and means for shifting fromthe high to the low speed driving mechanisms.

4. A stop mechanism having, in combination, a driven member, a highspeed driving mechanism therefor, a low speed driving mechanism thereforcomprising a friction clutch and a positive clutch, the friction clutchacting first to reduce the speed of the driven member to that of the lowspeed mechanism and the positive clutch then acting to drive the drivenmember, and means for throwing both of said clutches into and out ofoperation.

5. A driving and stopping mechanism for a machine comprising a shaft anda controlling member for controlling the operation of parts of themachine having, .in combination, high and low speed driving mechanismsfor said shaft, means for shifting from the high to the low speeddriving mechanisms, and means for rendering the controlling memberactive at least a predetermined interval after the low speed drivingmechanism is thrown in.

(i. A driving and stopping mechanism for a machine comprising a shaftand a controlling cam for controlling the operation of parts of themachine having, in combination, high and low speed driving mechanisms,means for shifting from the. high to the low speed driving mechanisms,and connections for rendering the controlling cam active at least apredetermined interval after the low speed driving mechanism is thrownin.

7. A driving and stopping mechanism for a machine comprising a shaft anda rotatable controlling member for controlling the operation of parts ofthe machine having, in combination, high and low speed drivingmechanisms, means for shifting from the high to the low speed drivingmechanisms, and connections between the controlling member and the lowspeed driving mechanism for rotating the controlling member apredetermined number of degrees a predetermined interval at least afterthe low speed driving mechanism is thrown in.

8. A driving and stopping mechanism for av machine comprising a 'shaftand a rotatable controlling member for controlling the operation ofparts of the machine having, in combination, high and low speed drivingmechanisms, means for throwing in the high speed driving mechanism andfor shifting from the high to the low speed driving mechanisms,connections between the controlling member and the low speed drivingmechanism for rotating the controlling member a predetermined number ofdegrees a predeterminedv interval at least after the low speed drivingmechanism is thrown in, and means rendered active upon throwing in thehigh speed driving mechanism for returning the controlling member to itsinitial posit-ion.

9. A driving and stopping mechanism for a machine comprising va shaftand a controlling member for controlling the operation of parts ot themachine having., Yin combination, high and low sneed drivingmechanisn'is, means for shifting from the high to the low speed drivingmechanisms, for throwing out the low speed driving mechanism andforconnecting and .disconnecting the lcontrolling memberand the lowspeed driving mechanism to render the controlling member .active andinactive, and means to insurey that the controlling member shall berendered inactive a predetermined interval rbet'ore the low speedmechanism is thrown out.

l0. A driving and stopping mechanism fora machine comprising a shaft and`a controlling member. for controlling the operation of parts of themachine having, in ecn bination, high land low speed drivingmechanisms,-means or `shifting from the high to the flow speed drivingmechanisms, for throwing Aout the -low speed driving mechanism and forconnecting and disconnecting the controllingv member `and 'the low speeddriving mechanism to render the controlling member kact-ive andinactive, and means to insure that the controlling member shall berendered active apredetermined interval atter the low speed mechanism isthrown in and rendered inactive a predetermined interval before the lowspeed mechanism is thrown ont.

11. A driving and stopping mechanism for a. machine comprising a shaftand a ro- -tatable controlling member for controlling thc operation ofparts of the machine having, in combination, high and low speed drivingmechanisms, means for throwing in the high speed driving mechanism andfor shifting from the high to the low speed drivingl mechanisms, andconnections between the controlling member and the low speed drivingmechanism for rotating the controlling member a predetermined number ofdegrees while the low speed driving mechanism is thrown in, a latch forretaining the controlling member in theposition moved, and means forreleasing the latch and for returning the controlling member to itsinitial position upon throwing in the high speed mechanism l2. A drivingand stopping mechanism fora machine comprising a shaft and a rotatablecontrolling member for controlling the operation of parts of the machinehaving, in combination, high and low speed driving mechanisms, means forthrowing in the high speed driving mechanism and for shifting from thehigh to the low speed driving mechanisms, a. spring acting to rotate thecontrolling member in one direction, connections between thecontrolling" member and the low speed driving mechanism for rotatingthe: controlling member against the action of 'said spring apredetermined number of degrees while the low speed driving mechanismfisthrown in, a. latch for retaining the controlling member in position,and, means for releasing the latch to permit said spring to return ythecontrolling member to itsinitial position upon throwing in the highspeed driving mechanism.

13. A driving and stopping mechanism for apmachine comprising a shaftand a rotatable controlling member for controlling the operation ofAparts of the machine having, in combination, high and low speeddrivingr mechanisms, means for connecting the controlling member and thelow speed driving mechanism to rotate the controlling ,member aiter thelow 'speed mechanism is thrown in, and meansiior disconnecting thecontrolling member and the low speed driving mechanism a predeterminedinterval thereafter.k

i4. A driving and stopping mechanism for a machine comprising a shaftand a rotatable controlling member for controlling the operation ofparts ot' the machine having, in combination, high and low speed drivingmechanisms, means `for shifting from the high to the low speed drivingmechanisms and for throwing out the low speed driving mechanisn'i, meansfor connecting the controlling member and the low speed drivingmechanism to actuate the. controlling member after the low speed driving-mechanism is thrown in, and means for disconnecting the controllingmember and the low speed driving mechanism a predetermined intervalbefore the low speed driving mechanism is thrown out.

l5. A driving and stopping mechanism for a machine comprising a shaftand a controlling member mounted for rotation about the shaft having, incombination, high and low speed driving mechanisms for said shaft, acollar mounted to slide longitudinally of the shaft and interposedbetween the controlling member and members of the low speed drivingmechanism, means for shifting from the high to the low speed drivingmechanisms, for throwing out the low speed driving mechanism and forconnecting and disconnecting the controlling member and the low speeddriving mechanism, comprising said collar acting when shifted in onedirection to connect the controlling member and the low speed drivingmechanism and when shifted in the opposite direction to disconnect thecontrolling member and the low speed driving mechanism and to throw outthe low speed driving mechanism, means for actuatin the collar toconnect the controlling mem er and the low speeddrving mechanism, andmeans for actuating the collar to disconnect the controlling member andthe low speed. driving mechanism a predetermined interval thereafter tothrow out the low speed driving mechanism. Y

16. A stop mechanism having, in combination, a shaft, high and low speeddriving mechanism therefor, means for shifting from theY high to the lowspeed driving mechanism, means acting automatically to disconnect thelow speed driving mechanism and shaft, and means for maintaining suchdisconnection while permitting an independent rotation of the shaft. 17.A stop mechanism having, in com* VVbination, a shaft, high and loivspeed driving mechanism therefor, means for shifting from the high tothe low speed driving mechanism, a Vcam and suitable connections fordisconnecting the low speed driving mechanism and shaft, means forinsuring at least a predetermined amount of slow speed drive before suchdisconnection, and means for maintaining such disconnection whilepermitting an independent rotation of the shaft. i

18. A driving and stopping` mechanism having, in combination, a shaft,high and low speed driving mechanism therefor, means for shifting fromthe high to the low speed driving mechanism and back to the high speeddriving mechanism, means for disconnecting the low speed drivingmechanism and shaft, and means for ensuring at least a predeterminedamount of low speed drive before such disconnection.

19. A driving and stopping mechanism having, in combination, a shaft,high and low speed driving mechanism therefor, mechanism fordisconnecting the low speed driving mechanism and shaft to stop theshaft, treadle actuated connections for shifting from the high to thelow speed driving mechanism and back to the high speed driving mechanismandefor throwing said disconnecting mechanism into operation, and a camactuated stop for said connections to time the throwing in of saiddisconnecting mechanism.

20. A driving and stopping mechanism having, in combination, a shaft,high and iow speed driving mechanism therefor, means for disconnectingthe low speed driving mechanism and shaft to stop the shaft, means forshifting from the high to the lonT speed driving mechanism and back tothe high speed driving mechanism without throwing said disconnectingmeans into operation, and automatically acting means for throwing saiddisconnecting means into operation.

ALFRED B. FOWLER.

